C8.3 Commercial Marine and Ind [...] Maintenance Schedule Section 2 - Maintenance Guidelines Page 2-5 Zinc Anode - Check 3 Cooling System Hoses - Check Sea Water Hoses - Check Air Cleaner Restriction - Check Batteries - Check Battery Cables and Connections - Check Component Connector and Pin Inspection - Check Maintenance Procedures at 300 Hours or 1 Year 1, 2 Fuel Filter (Spin-On Type) - Change Fuel-Water Separator Element - Replace Lubricating Oil and Filters - Change 2 Coolant Filter - Change Engine Coolant Heater - Check Marine Gear Oil Cooler - Flush 1 Supplemental Coolant Additive (SCA) and Antifreeze Concentration - Check 2 Heat Exchanger - Flush Sea Water Pump - Replace Aftercooler Assembly (Sea Water) - Flush Air Cleaner Assembly (Engine-Mounted) - Check